Granted Patent
Utility
US 5,224,556 · App. 07/760,549
Downhole activated process and apparatus for deep perforation of the formation in a wellbore
Inventors:
Dennis R. Wilson, Robert L. Coffee
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Sep 16, 1991
Inventors
Dennis R. Wilson
Robert L. Coffee
Assignee (at issue)
Conoco Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.